ie 
126 Scientific Intelligence. 
Of course all calculation must be mere guess-work, as who can meas- 4 
ure a fiery flood? I never witnessed such mighty results = pow : 
it into its head to walk. There was a solid plain which we might have — 
crossed some eight and forty hours before now going full drive overa 
precipice some thirty or forty feet deep, and then stealing onward, as 
it now is, through chestnut groves and vineyards and villages, and threat- 
ening places of some consideration. Above the precipice the stream— 
or rather two streams, which are united at the cataract—flows through 
a plain in a serpentine form, and following buck its course we arrived 
at the foot of the cone. Half 
he thin crust trembles under your feet. You ma ’ see the stones dance 
With the tremulous movement; the part immediately round the crate 
